False-colour scanning electron micrograph (SEM) of unactivated blood platelets on the surface of endothelium. Platelets,or thrombocytes,are small,non-nucleated cells formed in the bone marrow. They occur in circulating blood in large numbers. In an unactivated state they are shaped like round or oval wafers 2-3 micrometres in diameter; activated platelets (see photo P256/013) have dendritic processes. Platelets function in 2 ways: they help plug small defects in the walls of small blood vessels; & they are involved in blood clotting & in the release of serotonin,which reduces blood flow by constricting damaged vessels. Magnification: x4800 at 6x4.5cm size | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / NIBSC |
Bildgröße: | 4370 px × 4095 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |